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| From | Bob Eager <news0006@eager.cx> |
|---|---|
| Newsgroups | alt.sys.pdp8 |
| Subject | Re: PDP-8 ASCII question |
| Date | 2016-04-04 12:08 +0000 |
| Message-ID | <dmf3pdFs66uU6@mid.individual.net> (permalink) |
| References | <7ac59376-b031-44ac-9601-490ec29b3ece@googlegroups.com> <ndp8ap$k9r$1@gioia.aioe.org> <c5092533-2e15-47f0-add5-c012dab736a6@googlegroups.com> <pfp9tc-bvt.ln1@news.informatik.uni-stuttgart.de> <u5u9tc-u66.ln1@sambook.reistad.name> |
On Mon, 04 Apr 2016 13:01:50 +0200, Morten Reistad wrote: > In article <pfp9tc-bvt.ln1@news.informatik.uni-stuttgart.de>, Christian > Corti <cc@corti-net.de> wrote: >>Dylan McNamee <dylan.mcnamee@gmail.com> wrote: >>> That is a great thread - thanks for the pointer! It seems that this is >>> mostly an artifact of papertape and 6-bit ASCII, both >>of which (mostly) went away after the PDP-8. >> >>No and no. >>First, ASCII is seven bits (octal 0-177). Second, it has nothing to do >>with papertape or Teletypes. DEC simply defined the parity bit to be >>mark (i.e. always 1), since the serial interface is 8 bits fixed. > > They were not alone in doing this. Prime computer also had the MSB set > in all of their ASCII. Saving a few cents worth of hardware in the > serial ports and/or some cycles processing them. But leading to decades > of incompatibility. ISTR having the same thing on a Honeywell DDP-516.
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PDP-8 ASCII question dylan.mcnamee@gmail.com - 2016-04-02 11:32 -0700
Re: PDP-8 ASCII question Rob Doyle <radioengr@gmail.com> - 2016-04-02 12:59 -0700
Re: PDP-8 ASCII question Dylan McNamee <dylan.mcnamee@gmail.com> - 2016-04-02 14:04 -0700
Re: PDP-8 ASCII question Christian Corti <use@reply.to> - 2016-04-04 11:41 +0200
Re: PDP-8 ASCII question Morten Reistad <first@last.name.invalid> - 2016-04-04 13:01 +0200
Re: PDP-8 ASCII question Bob Eager <news0006@eager.cx> - 2016-04-04 12:08 +0000
Re: PDP-8 ASCII question Morten Reistad <first@last.name.invalid> - 2016-04-04 16:15 +0200
Re: PDP-8 ASCII question Klemens Krause <krause@informatik.uni-stuttgart.de> - 2016-04-04 15:21 +0200
Re: PDP-8 ASCII question Johnny Billquist <bqt@softjar.se> - 2016-04-04 17:41 +0200
Re: PDP-8 ASCII question "Charles Richmond" <numerist@aquaporin4.com> - 2016-04-04 15:11 -0500
Re: PDP-8 ASCII question Rich Alderson <news@alderson.users.panix.com> - 2016-04-04 20:53 -0400
Re: PDP-8 ASCII question "Charles Richmond" <numerist@aquaporin4.com> - 2016-04-05 15:16 -0500
Re: PDP-8 ASCII question Johnny Billquist <bqt@softjar.se> - 2016-04-06 15:49 +0200
Re: PDP-8 ASCII question Johnny Billquist <bqt@softjar.se> - 2016-04-05 16:43 +0200
Re: PDP-8 ASCII question Rich Alderson <news@alderson.users.panix.com> - 2016-04-05 15:15 -0400
Re: PDP-8 ASCII question "Charles Richmond" <numerist@aquaporin4.com> - 2016-04-05 15:20 -0500
Re: PDP-8 ASCII question Johnny Billquist <bqt@softjar.se> - 2016-04-06 15:54 +0200
Re: PDP-8 ASCII question "Charles Richmond" <numerist@aquaporin4.com> - 2016-04-06 15:08 -0500
Re: PDP-8 ASCII question Johnny Billquist <bqt@softjar.se> - 2016-04-07 15:50 +0200
Re: PDP-8 ASCII question cjl <clasystems@gmail.com> - 2017-03-25 04:07 -0700
Re: PDP-8 ASCII question Charles Richmond <numerist@aquaporin4.com> - 2017-09-29 10:27 -0500
Re: PDP-8 ASCII question Klemens Krause <krause@informatik.uni-stuttgart.de> - 2017-10-02 18:09 +0200
Re: PDP-8 ASCII question Charles Richmond <numerist@aquaporin4.com> - 2017-10-07 15:21 -0500
Re: PDP-8 ASCII question Klemens Krause <krause@informatik.uni-stuttgart.de> - 2017-10-09 14:01 +0200
Re: PDP-8 ASCII question Charles Richmond <numerist@aquaporin4.com> - 2017-10-12 23:40 -0500
Re: PDP-8 ASCII question Klemens Krause <krause@informatik.uni-stuttgart.de> - 2017-10-16 14:38 +0200
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